Differential mechanism foe cash



B. BERIA Sept. 29, 1942.

DIFFERENTIAL MECHANISM FOR CASH REGISTERS I Original Filed March 28,i936 Patented Sept. 29, 1942 UNITED STATES PATENT OFFICE DIFFERENTIALMECHANISM FOR CASH REGISTERS Biagio Beria, Turin, Italy; vested in theAlien Property Custodian 2 Claims.

This invention is a division of application Serial No. 71,522 filedMarch 28, 1936 by the same applicant and relating to a cash registercomprising a main shaft and a driving member for each row of amountkeys, which perform in a first period of the operation a forwardrotation and in a second period of the operation a backward rotationover a constant extent, whereby each driving member moves a wheelsetting the wheels of the totalizer, the indicator and the type wheelsby an extent which is proportional to the value of the depressed key.

One object of the invention is to provide a device of simpleconstruction and dependable working to transmit to the setting a wheel arotation in one direction through an angle corresponding to thedepressed amount key.

Another object of the invention is to provide an actuating device foreach setting wheel comprising a rockable arm carrying a hook-shaped beamhaving a key-controlled pawl so arranged that during the forwardmovement of the arm, the hook-shaped beam is kept free from the settingwheel, while during the backward movement the hook-shaped beam iscarried by the depressed key into engagement with the setting wheel,which is carried along in motion to effect the desired adding operation.

A further object of the invention is to provide suitable means topositively maintain the hookshaped beam in engagement with the settingwheel during the adding operation.

A further object of the invention is to provide suitable means fordisengaging the hook-shaped beam from the setting wheel at the end ofeach adding operation.

Other objects and advantages of the invention will appear from thefollowing specification with reference to the annexed drawing, in which:

Fig. 1 is an elevation view of the advancing arrangement disengaged fromthe setting wheel, and

Fig. 2 is a partial View of Fig. 1, showing the advancing device inengagement with the setting wheel.

Referring to the drawing, denotes a bedplate and 2 a cover plate. Adriving shaft 3 is mounted on the baseplate and carries a double cam I2and I3, on which ride the rollers l4 and I5 of a lever l6 pivoted on thestationary pivot H. A lever I8 is pivoted to the lever I6 and isconnected by its upper end to the arm is keyed on the main shaft 20. Bythis arrangement, the main shaft 20 receives in the first period of eachturn of the driving shaft 3 an oscillation in the direction of the arrowA of Fig. 1 (return stage) and in a second period of the same turn anoscillation in the opposite direction (arrow B) (actuating stage), eachoscillation extending over about 66.

A keyboard comprising as many columns of nine keys 5 as required by theimportance of the amounts cashed is arranged on the cover plate. Asetting wheel 2| loosely mounted on the main shaft 20 is provided foreach column of keys.

Beside each wheel 2| an arm 23 is keyed on the shaft 20 and rotates inthe second period the respective setting wheel 2| through an angleaccording to the position of the key 5 depressed in the correspondingcolumn. For this purpose each setting wheel 2| carries attached theretoa segment comprising nine teeth 22 extending over a portion of theperiphery somewhat smaller than the angle of oscillation of the mainshaft 20, for instance over each tooth 22 bein opposite a key 5 of therespective column. A beam 25 is articulated to the free end of the arm23 and its end forms the hook 26 which cooperates with the teeth 22. Apawl 21 is articulated to the beam 25 in proximity to the hook 26 and issubjected to the action of a spring 26 tending to bring a projectionthereon against a stop 28. During the first period as the arm 23oscillates in the direction of the arrow A, the beam 25 passes betweenthe keys 5 and teeth 22 without the hook 26 becoming engaged by one ofthe teeth 22, even if one of the keys 5 is depressed. The pawl 27 ridingin this direction yields on meeting a lowered key 5. If, on the nextoscillation of the arm 23 (arrow B, second period) the pawl 21 meets adepressed key 5, the pawl cannot yield being withheld by the stop 28 onthe beam 25. As the arm 23 moves further (Figure 2), the beam oscillatescausing the hook 26 to be engaged by the tooth 22 corresponding to thedepressed key 5. The setting wheel 2| is carried along by the arm 23 onthe remainin portion of the oscillation of the arm 23 till, towards theend of the second period, the hook is released I from the tooth 22 bythe following mechanism:

An arm 24 is loosely mounted on the hub of the arm 23 (Figs. 1, 2) andits free end is formed with a out between the extensions 30 and 3|, saidout engaging the pin 29 attached to the end of the beam 25 opposite thehook 25. The extension 3| forms the step 32. A spring 33 is stretchedbetween the pin 29 and an extension 34 of the arm 24. The arm 24 iscarried along by the arm 23 during the first period in which the arm 23oscillates in the direction shown by the arrow A, for the pin 29 meetsthe extension 30; during rotation in the direction of the arrow B(second period) the arm 24 is carried along by the pin 29 which abutsthe extension 3| below the step 32. On depression of a key 5 the hook 26is engaged by a tooth 22 (Figure 2) and the pin 29 oscillates outwardlyto the level of the step 32 and, under the action of the spring 33, thearm 24 is drawn nearer the arm 23 while the pin 29 comes to bear on thestep 32. The engagement between the hook 26 and tooth 22 is maintainedand both arms oscillate further together in the direction of the arrowB. At the end of the oscillation the arms 24 pass under a pawl 35(Fig. 1) rockably mounted on the shaft 38 and operated by the cam 40 onthe main shaft 3 through the lever 40a, link 40 lever 40c, pawl BI andlink 62 in such manner that its lower end is lifted (position shown indotted lines in Fig. 1) when the arms 23, 24 perform their oscillations.When the arms 23 and 24 have finished their second period oscillationand resume their initial position, the pawl 35 is caused to oscillate tothe position shown in full lines in Fig. 1, pushing away the arm 24 fromthe arm 23 in the direction of the arrow B. The pin 29 thus set freefrom the step 32 snaps under the action of the spring 33 causing thehook 26 to become released from the tooth 22.

When, during the first period of the next operation, the arm 23 isoscillated in the direction of the arrow A, all the setting wheels arereturned to zero by an extension 36 on the arm 23 which abuts anabutment 31 provided on one of the spokes of the setting wheel 2|.

When no amount key 5 is depressed in the column, the respective settingwheel 2| remains stationary, The oscillation performed during the secondperiod proportional in extent to the value of the amount (actuatingstage) is transmitted to a general totalizer and, if desired, to one ofa number of partial totalizers, to printing rollers and indicatorwheels. For this purpose each setting wheel 2| is provided with a set ofteeth 45.

What I claim is:

1. In a differential mechanism for a machine of the class described, thecombination of amount-keys, comprising, for each order, a setting wheel,a rockable arm, a hook-shaped beam articulated on said arm, akey-controlled pawl on said beam engaged by a depressed key duringswinging movement of the arm in one direction to bring the hooked beaminto engagement with the setting wheel, a loose arm, a projection onsaid hooked beam, a stepped notch on the loose arm receiving saidprojection, the step of which being capable to hold the hooked beam intoengagement with the setting wheel, a spring interposed between the loosearm and the projection for moving the step under the projection whenraised by the pawl bringing the beam into engagement with the settingwheel, and means for moving the step out from under the projection,whereby the spring disengages the hooked beam from the setting wheel.

2. A machine according to claim 1, in which the means for moving thestep out from under the projection comprises a push member, a shaft, alever, a linkage connecting said push member and lever, and a cam on theshaft acting on said lever for pushing said member against said loosearm at the end of the oscillation.

BIAGIO BERIA.

